Mobile & Ohio 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 12 (Locobase 16011)

Data from Birmingham & Northwestern Locomotive Diagrams supplied in August 2013. Works numbers were 1569-1574 in September 1885.

This Mogul sextet from the Ocean State was originally ordered by the St Louis & Cairo, which was acquired by the M&O before they were delivered.

One of the six was sold in 1912 to the B&NW as its #20. Their diagram showed a firebox heating surface area of 217 sq ft. That eye-popping figure is clearly too high and other figures in the diagram confirms a math error that added 100 sq ft to the actual figure.

Class E (Locobase 7358)

Data from AB&SOU 6 -1919 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 11, p. 10. Works numbers were 6350-6351 in August 1882; 6401-6402, 6411, 6414, 6430-6431 in October.

The details in the Baldwin spec book differ a little from the A&S diagrams, differences that probably stem from the later installation of a new boiler. When ordered, the locomotives were to have 200 2' tubes, each measuring 10 ft 8 3/8 inches (3.26 m). Weight estimates came in much lower than the later diagrams would suggest: 66,000 lb (29,937 kg) on the drivers, and 80,000 lb (36,287 kg) for the total engine weight. The tenders were smaller, too, holding only 2,400 US gallons (9,084 litres).

#62 (works 6401) was sold to the Alabama & Mississippi in 1909; that railroad sold the 62 to the Mississippi & Alabama (probably a corporate, rather than a physical, move) in September 1922. #65 (6411), by now renumbered 503, took that number to the De Kalb & Western (Sanoody Valley) by 1915 to help open the line in 1916. The other five were scrapped by 1922.

Specifications by Steve Llanso of Sweat House Media
Locobase ID16,011 7358
RailroadMobile & OhioMobile & Ohio
Number in Class68
Road Numbers12-17/108-11360-67/500-501, 503, 502, 504-505
Number Built68
BuilderRhode IslandBurnham, Parry, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)14.7515.04
Engine Wheelbase (ft)22.8322.58
Ratio of driving wheelbase to overall engine wheebase 0.65 0.67
Overall Wheelbase (engine & tender) (ft)44.71
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)72,00078,000
Engine Weight (lbs)100,00089,400
Tender Loaded Weight (lbs)75,00080,600
Total Engine and Tender Weight (lbs)175,000170,000
Tender Water Capacity (gals)30003500
Tender Fuel Capacity (oil/coal) (gals/tons)1012
Minimum weight of rail (calculated) (lb/yd)4043
Geometry Relating to Tractive Effort
Driver Diameter (in)55.5055
Boiler Pressure (psi)140140
High Pressure Cylinders (dia x stroke) (in)18" x 24"18" x 24"
Tractive Effort (lbs)16,67316,824
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32 4.64
Heating Ability
Firebox Area (sq ft)117.84130
Grate Area (sq ft)12.5017
Evaporative Heating Surface (sq ft)11441323
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)11441323
Evaporative Heating Surface/Cylinder Volume161.84187.17
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation17502380
Same as above plus superheater percentage17502380
Same as above but substitute firebox area for grate area16,49818,200
Power L131753582
Power MT291.65303.73

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